EP3088116B1 - Vacuum soldering apparatus and control method therefor - Google Patents

Vacuum soldering apparatus and control method therefor Download PDF

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Publication number
EP3088116B1
EP3088116B1 EP13900455.0A EP13900455A EP3088116B1 EP 3088116 B1 EP3088116 B1 EP 3088116B1 EP 13900455 A EP13900455 A EP 13900455A EP 3088116 B1 EP3088116 B1 EP 3088116B1
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EP
European Patent Office
Prior art keywords
control
evacuation
gradient
property
vacuum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13900455.0A
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German (de)
English (en)
French (fr)
Other versions
EP3088116A1 (en
EP3088116A4 (en
Inventor
Tsutomu Hiyama
Hiroyuki Inoue
Shunsuke Kimoto
Tomotake Kagaya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Senju Metal Industry Co Ltd
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Senju Metal Industry Co Ltd
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Publication date
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Publication of EP3088116A1 publication Critical patent/EP3088116A1/en
Publication of EP3088116A4 publication Critical patent/EP3088116A4/en
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Publication of EP3088116B1 publication Critical patent/EP3088116B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
    • B23K3/08—Auxiliary devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0016—Brazing of electronic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/008—Soldering within a furnace
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
    • B23K1/203—Fluxing, i.e. applying flux onto surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/02—Multi-stage pumps
    • F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0261—Surge control by varying driving speed
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
    • H05K3/3494—Heating methods for reflowing of solder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • B23K2101/42—Printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/04—Soldering or other types of metallurgic bonding
    • H05K2203/043—Reflowing of solder coated conductors, not during connection of components, e.g. reflowing solder paste
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/08—Treatments involving gases
    • H05K2203/085—Using vacuum or low pressure
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/11—Treatments characterised by their effect, e.g. heating, cooling, roughening
    • H05K2203/1178—Means for venting or for letting gases escape

Definitions

  • the present invention relates to a vacuum soldering apparatus according to the preamble of claim 1 (see for example US 2007/0048145 ) which has a function to remove voids from vacuum molten solder to be defoamed or deaerated when mounting a surface mounting component or the like on a substrate at a predetermined position thereof and soldering the component and the substrate, and a control method thereof.
  • voids air bubbles generated in a hot blast (air) reflow processing in normal atmospheric pressure during a reflow mounting process of large current device such as mounting process of power device and power module have been held in question.
  • FIGS. 19A and 19B are processing diagrams for showing the hot blast reflow processing according to a past example.
  • Cream solder 8 shown in FIG. 19A is applied onto a pad electrode 4 of a substrate 5.
  • the cream solder 8 is formed by adding flux to solder powder so as to have an appropriate viscosity.
  • the cream solder 8 is applied onto the pad electrode 4 of the substrate 5 by a screen printer through a mask.
  • the following will schematically describe the voids generation in such a hot blast reflow processing condition that the cream solder 8 is applied onto the pad electrode 5 of the substrate 5 but the electronic component is not mounted, with reference to FIGS. 19A and 19B .
  • the solder 3 shown in FIG. 19B is formed so that the molten solder 7 is cooled and spherically solidified by its surface tension after the cream solder 8 shown in FIG. 19A has been subjected to the hot blast reflow process.
  • Circular white portions shown in the drawing indicate the voids 2 which unsatisfactorily occur in the molten solder 7 and remain in the solder 3 after the cooling and solidification thereof.
  • the voids 2 damage heat conduction effects in the power device and the like and cause waste heat to deteriorate.
  • a patent document 1 discloses a soldering apparatus (vacuum reflow apparatus) having a vacuum evacuation function.
  • This solder apparatus is provided with an exhaust valve, a vacuum pump and a treatment chamber. Under the condition in which the substrate is imported into the treatment chamber and the solder on the pad electrode of the substrate is melted, the exhaust valve is opened and the vacuum pump is driven so that the interior of the treatment chamber can be once evacuated.
  • a vacuum condition allows any voids which remain in the solder while the solder is melted to be removed by defoaming and/or deaerating effect.
  • Patent Document 1 Japanese Patent Application Publication No. Hei09-314322 .
  • Other previously proposed arrangements are disclosed in US 2007/048145 and JP 2011/245527 .
  • the voids are removed to be defoamed and/or deaerated by the evacuation but the degree of vacuum continuously varies so that they are suddenly defoamed and/or deaerated.
  • the voids 2 in the molten solder 7 are broken (burst) during they are defoamed and/or deaerated, and this causes flux scattering, component scattering and solder scattering.
  • control portion sets a pump output to be changed which is greater than a current pump output in the previously prepared evacuation control properties, and the control portion changes the control from the evacuation control property of small pump output to the evacuation control property of large pump output when both of the gradient of the evacuation control property to be changed and the initially set gradient ⁇ are agreed with each other.
  • control portion always compares the initially set gradient ⁇ in the evacuation control property with a threshold gradient ⁇ th which is a change evaluation criterion, in the evacuation, and the control portion changes the control from the evacuation control property of small pump output to the evacuation control property of large pump output when the initially set gradient ⁇ of the evacuation control property exceeds the threshold gradient ⁇ th.
  • control portion performs a step of obtaining the evacuation control properties at preliminary evacuation to prepare a table; and a step of changing the control from the evacuation control property of small pump output to the evacuation control property of large pump output at main evacuation, when both of the gradient of the evacuation control property to be changed and the initially set gradient 8 are agreed with each other in evacuation, the pump output to be changed being greater than a current pump output in the previously prepared evacuation control properties.
  • control portion In the control method of the vacuum soldering apparatus according to Claim 4, which is claimed in Claim 6, the control portion always compares the initially set gradient ⁇ in the evacuation control property with a threshold gradient ⁇ th which is a change evaluation criterion during evacuation, and the control portion changes the control from the evacuation control property of small pump output to the evacuation control property of large pump output when the initially set gradient ⁇ of the evacuation control property exceeds the threshold gradient ⁇ th.
  • the plurality of the evacuation control properties is previously prepared and the control portion that performs an evacuation control of the pump is provided.
  • the control portion is configured to change from the evacuation control property of small pump output to the evacuation control property of large pump output based on the initially set gradient ⁇ in the evacuation control properties.
  • This invention has an object to provide the vacuum soldering apparatus, which can evacuate the chamber to the specified target degree of vacuum in brief time, suppress occurrence of the voids to prevent flux, components or the like from being scattered, and the control method thereof.
  • the vacuum reflow furnace 100 shown in FIG. 1 forms an example of the vacuum soldering apparatus.
  • it is configured so as to perform defoaming/deaerating process under vacuum condition when mounting a surface mounting component such as a power device, a power module or the like on a printed circuit board at a predetermined position and soldering the component and the printed circuit board.
  • An object of the soldering is the printed circuit board, solder coated component, other semiconductor wafer and the like.
  • work 1 hereinafter, they will be generically referred to as "work 1".
  • the vacuum reflow furnace 100 has a main body 10.
  • the main body portion 1 constitutes a muffle furnace.
  • the main body 10 has a conveying path 16 at an intermediate layer thereof.
  • the main body 10 is divided from a muffle upper portion and a muffle lower portion, not shown, on the basis of the conveying path 16.
  • the main body 10 is provided with a hinge mechanism at rear side thereof and the muffle upper part is lid-opened so that the conveying path can be seen and inspected.
  • An inlet 11 is provided at a side of the main body 10 and an outlet 12 is provided at the other side thereof.
  • a conveying portion 13 is provided on the conveying path 16 between the inlet 11 and the outlet 12.
  • a conveyance mechanism 70 of walking beam type is used (see FIG. 5 ). According to this conveyance mechanism 70, the work 1 can be intermittently fed at a predetermined velocity.
  • a preliminary heating portion 20, a main heating portion 30, the chamber 40 and a cooling portion 50 are arranged in order from the inlet 11 and the work 1 is intermittently fed by being passed through them to reach the outlet 12.
  • the preliminary heating portion 20 and the main heating portion 30 constitute an example of a heating portion which employs a hot blast circulation heating system.
  • the preliminary heating portion 20 has four preliminary heating zones I through IV which are gradually heated (for example, 150 degrees C to around 180 degrees C through 160 and 170 degrees C) to reach a predetermined temperature (for example, 180 degrees C) .
  • the preliminary heating zones I through IV are arranged upper and lower the conveying path 16.
  • the main heating portion 30 having a main heating zone V is arranged adjacent the preliminary heating portion 20.
  • the main heating zone V heats the work 1 up to around 250 degrees C before the work 1 enters the chamber 40.
  • the chamber 40 with vacuum defoaming and/or deaerating zone VI is provided at a position that is adjacent to the main heating portion 30.
  • the chamber 40 performs defoaming/deaerating process under vacuum environment when performing the soldering on the work 1.
  • the chamber 40 shown in FIG. 2 contains a container 41, a base 42 and an elevating mechanism 43. It shows a state where the container 41 is away from the base 42 and stops at a predetermined upper position.
  • the stop position of the container 41 is referred to as "a home position Hp".
  • the home position Hp is a position where the container 41 is positioned above the base 42 by a height "h" from a reference position thereof.
  • the height "h” may be height such that the work 1 is not hindered from being imported from the main heating portion 30 to the base 42.
  • the container 41 has a housing structure with the bottom being opened. For example, it is arranged so that a case-like body made of stainless steel is upside down to become a cover. An interior of the container 41 is a cavity (space).
  • the container 41 is configured to move vertically by the elevating mechanism 43.
  • a conveying direction of the work 1 is set to be "x" direction
  • a direction that is orthogonal to this conveying direction is set to be "y" direction
  • a direction that is orthogonal to the "x" and "y” directions is set to be "z” direction
  • the container 41 moves vertically along this "z" direction when performing any vacuum processing.
  • the base 42 is arranged under the container 41 and the elevating mechanism 43 is arranged under this base 42.
  • a hydraulically-operated cylinder, a pneumatically-operated cylinder or the like is used in the elevating mechanism 43.
  • the base 42 has a plane which is broader than an area of the bottom of the container 41 and a predetermined thickness.
  • the base 42 has an airtight seal member 48 at a position that the bottom of the container 41 touches.
  • the seal member 48 is required to have any heat-resistant properties, fluorine-based packing, for example, is used.
  • An exhaust port 201 is provided at a predetermined position under the base 42.
  • the exhaust port 201 is contacted with an electromagnetic valve 22 shown in FIG. 4 .
  • a gas- supplying port 203 is provided at a predetermined position of a bottom of the base 42.
  • the gas- supplying port 203 is connected with release valves 25 shown in FIG. 4 .
  • a panel heater 44 is provided at a predetermined position of the base 42 of the container 41.
  • the panel heater 44 constitutes an example of the heating portion and heats the work 1 to a predetermined temperature (around 240 degrees C) to keep it. This heating is because the predetermined temperature by the main heating portion 30 before the work 1 has entered into the chamber 40 is maintained after the work 1 enters into the chamber 40.
  • Heating system of the panel heater 44 is a far infrared radiation panel system as an example thereof.
  • the panel heater 44 is not limited to that on the base 42: It may be provided at a predetermined position in a side of the container 41.
  • a pair of fixed beams 45, 46 is provided at a predetermined position of each side on the upper surface of the base 42.
  • the fixed beams 45, 46 form the conveying portion 13.
  • the fixed beam 45 is arranged at a left side end of the upper surface of the base 42 and the fixed beam 46 is arranged at a right side end of the upper surface of the base 42. They are configured to support both sides of the work 1 in the chamber 40.
  • the fixed beams 45, 46 are composed of plate-like block members and a plurality of pins 47 each having a cone-shaped head are arranged on the upper surface of each of the plate-like block members.
  • the pins 47 are grouped four by four and stand in line with a predetermined arrangement pitch. They stand in line with the predetermined arrangement pitch is because the works 1 having plural lengths can be supported by them without hindrance corresponding to the works 1 having lengths.
  • the vacuum reflow furnace 100 is configured.
  • the cooling portion 50 having a cooling zone VII is provided at an adjacent position of the chamber 40. This is a zone to cool down the work 1 which has been defoamed and/or deaerated (hereinafter, referred to as "vacuum deaerating process") after vacuum-break is performed.
  • the work 1 thus cooled is exported from the apparatus via the outlet 12.
  • a pad electrode 4 is formed on a substrate 5 such as a printed circuit board, a semiconductor wafer and the like, particularly, a substrate for power device as the work 1 and the solder 3 is formed on this pad electrode 4 will be described.
  • FIG. 3A shows a condition of molten solder 7 in which the solder 3 has not yet solidified.
  • White shapes (circles or ellipses) shown in the drawing indicate the portions of the voids 2, the shapes of which are considerably grown as the vacuum pressure in the chamber 40 becomes lower (the degree of vacuum becomes higher).
  • the voids 2 are drawn to outside in the evacuation process so that there occurs a difference in the vacuum pressures between the voids 2 and a boundary surface of the solder.
  • the voids 2 in the molten solder 7 come out to outside. (They are defoamed and/or deaerated).
  • the solder 3 shown in FIG. 3B indicates a melted condition thereof when the vacuum pressure in the container 41 reaches a target pressure (hereinafter, referred to as "set target pressure Pf').
  • a control is performed so that the evacuation control properties are successively changed by the evacuation control having gradients ⁇ , which will be described with reference to FIG. 6 , the chamber 40 is evacuated to the set target pressure Pf (specified degree of vacuum), and after the set target pressure Pf which has been previously set is reached, this set target pressure Pf is maintained for a predetermined time.
  • the voids 2 in the molten solder are gradually defoamed and/or deaerated by the evacuation control with the gradients ⁇ until the set target pressure Pf is reached, it is possible to avoid breaking (bursting) the voids 2, which has occurred in past, so that flux scattering and solder scattering occur. After the vacuum break, only voids having small shapes remain in the vicinity of outer surface. In this condition, the work 1 is cooled. Accordingly, the solder 3 in which the voids 2 are decreased can be formed on the pad electrode 4.
  • an operation part 21, the electromagnetic valve 22, a pump 23, a vacuum pressure sensor 24, the release valves 25, an arrival sensor 26, the elevating mechanism 43, the panel heater 44, and a control unit 60 are provided for controlling the preliminary heating portion 20, the main heating portion 30, the chamber 40, the cooling portion 50 and the conveyance mechanism 70.
  • the control unit 60 has a control portion 61, a storage portion 62, a timing generation portion 63 and the like.
  • the evacuation control properties #1 through #4 or the like are obtained when the preliminary evacuation other than the main evacuation is performed.
  • a user selects desired evacuation control properties in the order of the highest number (or in the order of smallest frequency of the pump output) among the evacuation control properties #1 through #4 and the like and performs initially setting of the evacuation control properties with the gradients ⁇ .
  • a liquid crystal panel, numeric keys and the like are used for the operation part 21 . Any setting information indicating the evacuation conditions such as the evacuation control properties with the gradients ⁇ is output to the control portion 61 as operation data D21.
  • a start button is provided in the operation part 21 and instructs a "start" to the control portion 61.
  • the operation part 21 also instructs the control portion 61 to perform the preliminary evacuation when obtaining the evacuation control properties #1 through #4 and the like.
  • the conveyance mechanism 70 is provided in the conveying portion 13 and is connected with the control unit 60.
  • a conveyance device of walking beam type is used for the conveyance mechanism 70.
  • the control unit 60 outputs a conveyance control signal S13 to the conveyance mechanism 70.
  • the conveyance control signal S13 is a signal for allowing the moving beams 18, 28 to move and allowing the work 1 to be intermittently fed.
  • the preliminary heating portion 20 is connected with the control unit 60.
  • the control unit 60 outputs a preliminary heating control signal S20 to the preliminary heating portion 20.
  • the preliminary heating control signal S20 is a signal for allowing heaters, fans and the like in the preliminary heating portion 20 to be driven and controlling four preliminary heating zones I through IV to reach the temperature of the work 1 to at a predetermined temperature (for example, 180 degrees C).
  • the main heating portion 30 is connected with the control unit 60.
  • the control unit 60 outputs a main heating control signal S30 to the main heating portion 30.
  • the main heating control signal S30 is a signal for allowing heaters, fans and the like in the main heating portion 30 to be driven and heating the work 1 to 250 degrees C.
  • the elevating mechanism 43 is connected with the control unit 60.
  • the control unit 60 outputs an elevating control signal S43 to the elevating mechanism 43.
  • the elevating control signal S43 is a signal for elevating the container 41.
  • the panel heater 44 is connected with the control unit 60.
  • the control unit 60 outputs a heater control signal S44 to the panel heater 44.
  • the heater control signal S44 is a signal for maintaining inside of the tightly enclosed container 41 at a predetermined temperature.
  • the electromagnetic valve 22 is connected with the control unit 60.
  • a throttle valve for vacuum control is used for the electromagnetic valve 22.
  • the control unit 60 outputs an electromagnetic valve control signal S22 to the electromagnetic valve 22.
  • the electromagnetic valve control signal S22 is a signal for controlling valve opening position of the electromagnetic valve 22.
  • the pump 23 evacuates the chamber 40 based on the evacuation condition.
  • the pump 23 is connected with the control unit 60.
  • a rotary type vacuum pump (blower), reciprocating vacuum pump (piston) or the like is used for the pump 23.
  • the control unit 60 outputs a pump driving voltage V23 to the pump 23.
  • VVVF variable voltage variable frequency
  • the pump driving voltage V23 is voltage for controlling the output of the alternative current motor.
  • the arrival sensor 26 is connected with the control unit 60.
  • the arrival sensor 26 detects that the work 1 enters into the furnace 100 and outputs an arrival detection signal S26 indicating that the work 1 enters into the furnace 100 to the control unit 60.
  • a reflection type or transmission type optical sensor is used for the arrival sensor 26.
  • the arrival detection signal S26 is output to the control unit 60 to start a timer.
  • a position of the work 1 in the furnace 100 is calculated from a conveying speed of the work 1 and the like based on this timer.
  • the position of the work 1 may be calculated by the time for intermittently feeding it.
  • the vacuum pressure sensor 24 is connected with the control unit 60.
  • the vacuum pressure sensor 24 constitutes an example of a detection portion and detects vacuum pressure in the chamber 40 during the defoaming and/deaerating process to generate a vacuum pressure detection signal S24 (pressure detection information).
  • the vacuum pressure detection signal S24 is a signal for indicating the vacuum pressure in the chamber 40 and is output from the vacuum pressure sensor 24 to the control unit 60.
  • a diaphragm vacuum gage, a thermocouple vacuum gage, Pirani vacuum gage, Penning vacuum gage or the like is used for the vacuum pressure sensor 24 .
  • An end of the release valves 25 is connected with the gas- supplying port 203 of the base 42 shown in FIG. 2 and the other end thereof is connected with a gas- supplying portion 29 such as a nitrogen (N 2 ) gas cylinder, not shown, a hydrogen (H 2 ) gas cylinder, not shown, or the like.
  • the gas- supplying portion 29 has a proportional solenoid valve, not shown.
  • the gas- supplying portion 29 may supply at least one of N 2 gas (inert gas) and H 2 gas (activated gas for reducing) into the chamber 40.
  • the proportional solenoid valve is configured so as to adjust inflow rate of N 2 gas or H 2 gas.
  • the control unit 60 outputs a release valves control signal S25 to the release valves 25.
  • the release valves control signal S25 is a signal for controlling the release valves 25.
  • the valves having an initial release valve and a main release valve are used.
  • the initial release valve has a predetermined bore which is smaller than that of the main release valve.
  • the initial release valve is used when limiting the inflow rate of the gas into the chamber 40 or in a preceding operation of the main release valve.
  • the main release valve has a bore which is larger than that of the initial release valve so that the much inflow rate of the gas is passed through it, compared with a case of the initial release valve. Controlling the release valves 25 enables the inside of the chamber 40 to be adjusted to multiple stages of target vacuum pressure (Pa) during vacuum decompression.
  • Pa target vacuum pressure
  • the cooling portion 50 is connected with the control unit 60.
  • the control unit 60 outputs a cooling control signal S50 to the cooling portion 50.
  • the cooling control signal S50 is a signal for controlling heat exchangers, fans and the like.
  • the cooling system of the cooling portion 50 is a turbo fan (under nitrogen atmosphere).
  • the control unit 60 has the control portion 61, the storage portion 62 and the timing generation portion 63.
  • the control unit 60 is also provided with an analog to digital converter, not shown, an oscillator, not shown and the like.
  • the storage portion 62 is connected with the control portion 61 and stores control data D62.
  • the control data D62 is information constituting the evacuation control properties with the gradients ⁇ (for example, ⁇ 1 through ⁇ 4), each of which plots the evacuation time with regards to the degree of vacuum when evacuating the chamber 40 by a predetermined pump output (see FIG. 6 ).
  • the evacuation control properties #1 through #4 with four gradients ⁇ 1 through ⁇ 4 are tabled and referred.
  • the control data D62 includes the data for controlling the preliminary heating portion 20, the electromagnetic valve 22, the release valves 25, the main heating portion 30, the elevating mechanism 43, the panel heater 44, the cooling portion 50 and the conveyance mechanism 70, in addition to the data relating to the evacuation control properties #1 through #4.
  • a read only memory (ROM), a random access memory (RAM), hard disk drive (HDD) or the like is used for the storage portion 62.
  • control portion 61 For the control portion 61, a central processing unit (CPU) is used.
  • the control data D62 relating to the evacuation control properties #1 through #4 is expanded on RAM.
  • the control portion 61 performs the evacuation control of the pump 23 so that the evacuation control properties are changed from the evacuation control property of small pump output to the evacuation control property of large pump output based on the initially set gradient ⁇ of the evacuation control properties, and selected among the plurality of evacuation control properties #1 through #4 with the gradients ⁇ which have been previously prepared.
  • control portion 61 sets a pointer in the storage portion 62 and observes the gradient ⁇ of the evacuation control property to be changed, and the control portion 61 is configured so as to always compare the initially set gradient ⁇ in the evacuation control property with the gradient ⁇ of the evacuation control property to be changed and the like and change from the evacuation control property of small pump output to the evacuation control property of large pump output when both of the gradients ⁇ of the evacuation control properties are agreed with each other during the evacuation.
  • control portion 61 adjusts the degree of vacuum based on the vacuum pressure detection signal S24 and controls the electromagnetic valve 22 and the release valves 25 in addition to the pump 23 to maintain the degree of vacuum for a predetermined time.
  • the control portion 61 adjusts the degree of vacuum based on the vacuum pressure detection signal S24 and controls the electromagnetic valve 22 and the release valves 25 in addition to the pump 23 to maintain the degree of vacuum for a predetermined time.
  • the voids 2 in the molten solder 7 can be gradually defoamed and/or deaerated. Therefore, it is possible to prevent flux scattering, solder scattering or the like by breaking (bursting) the voids 2.
  • the timing generation portion 63 other than the storage portion 62 is connected with the control portion 61.
  • the timing generation portion 63 receives a reference clock signal obtained from an oscillator, not shown, and a control instruction from the control portion 61.
  • the timing generation potion 63 generates the preliminary heating control signal S20, the electromagnetic valve control signal S22, the release valves control signal S25, the main heating control signal S30, the elevating control signal S43, the heater control signal S44, the cooling control signal S50 and a conveyance control signal S70.
  • the control system of the vacuum reflow furnace 100 is configured.
  • the conveyance mechanism 70 of walking beam type has fixed beams 17, 27 and moving beams 18, 28. Feeding pitch of the moving beam 18, 28 is about 400 mm.
  • a side in which the work 1 is imported is set to be an "import side” and a side in which the work 1 is exported is set to be an "export side”.
  • the fixed beam 17 of the import side is provided in the preliminary heating portion 20 and the main heating portion 30.
  • the fixed beam 27 of the export side is provided in the cooling portion 50.
  • Pairs of the fixed beams 17, 27 are provided on both sides of the conveying path 16 one by one.
  • the moving beams 18, 28 operate to move up and down, right and left on the fixed beams 17, 27 of both sides (refer to loci (1) through (4) in the drawing: this is a walking).
  • a code, "a" indicates a home position of each of the moving beams 18, 28.
  • the moving beams 18, 28 are respectively configured to drive independently at the import side and the export side.
  • the moving beams 18 of the import side rises vertically (from the code, "a” to a code “b") along the locus (1) and receives the work 1 from the fixed beam 17 (fixed beam 45).
  • it moves horizontally (from the code, "b” to a code “c") along the locus (2) with mounting the work 1; it falls down vertically (from the code, "c” to a code “d") along the locus (3) and mounts the work 1 on the fixed beam 17 (fixed beam 45); it then moves horizontally (from the code, "d” to the code "a") along the locus (4) and returns to the home position Hp.
  • it intermittently feeds the work 1 successively.
  • the moving beams 28 of the export side moves horizontally (from the code, "a” to the code “b") along the locus (1).
  • It falls down vertically (from the code, "d” to the code "a") along the locus (4) and mounts the work 1 on the fixed beam 27 and it then returns to the home position Hp.
  • the conveyance mechanism 70 of walking beam type is configured.
  • the evacuation control properties #1 through #4 are obtained during preliminary evacuation time.
  • the preliminary evacuation time is referred to as time other than main evacuation time.
  • a vertical axis indicates pressure P [Pa] (degree of vacuum) in the chamber.
  • a horizontal axis thereof indicates time [second] which is required for the evacuation.
  • Pf indicates the set target pressure which is 10000 [Pa], in this embodiment.
  • the control property #1 is a property where it is possible to evacuate the chamber 40 by taking about 6 [seconds] to reach the set target pressure Pf.
  • the control property #2 is a property where it is possible to evacuate the chamber 40 by taking about 9 [seconds] to reach the set target pressure Pf.
  • the control property #3 is a property where it is possible to evacuate the chamber 40 by taking about 11 [seconds] to reach the set target pressure Pf.
  • the control property #4 is a property where it is possible to evacuate the chamber 40 by taking about 16 [seconds] to reach the set target pressure Pf.
  • Frequency f for obtaining the pump output Po1 is 60 Hz; Frequency f for obtaining the pump output Po2 is 40 Hz; Frequency f for obtaining the pump output Po3 is 30 Hz; Frequency f for obtaining the pump output Po4 is 20 Hz.
  • Magnitude correlation of these pump outputs Po1 through Po4 is indicated as Po1>Po2>Po3>Po4 in a case of pump output Po; 60 Hz>40 Hz>30 Hz>20 Hz in a case of the frequency f.
  • a gradient ⁇ 1 in the drawing is a gradient of the evacuation control property #1.
  • the gradient ⁇ 1 is an angle formed by a segment j-k (shown by the broken line) which is parallel with the vertical axis and a tangential line (broken line q-r1) of a graph of the evacuation control property #1.
  • a start point of the tangential line q-r1 is a start point q (100000 [Pa]) of the graph at the evacuation start time.
  • a gradient ⁇ 2 is a gradient of the evacuation control property #2 defined by the tangential line q-r2, which is similar to the gradient ⁇ 1.
  • a gradient ⁇ 3 is a gradient of the evacuation control property #3 defined by the tangential line q-r3.
  • a gradient ⁇ 4 is similarly a gradient of the evacuation control property #4 defined by the tangential line q-r4.
  • tan (90 degree - ⁇ ) degree of vacuum/time required therefor.
  • evacuation control properties #1 through #4 obtained at the preliminary evacuation time are expanded on the storage portion 62 (RAM or the like).
  • the evacuation control properties #1 through #4 are expanded on the same memory space with the above-mentioned start point q being repeated.
  • a thick broken line n-m in the drawing indicates a cursor which is used for looking for a next point of frequency f (a change point of the control properties).
  • the cursor n-m is scrolled toward a direction shown by an arrow defined by outlines (downward) at the same time as the start of the evacuation.
  • the scroll is realized by a fact such that CPU or the like of the control portion 61 sets a pointer on RAM or the like.
  • This scroll is performed for performing the vacuum soldering process so that when initially setting the gradient ⁇ , the pointer runs and the evacuation control property with the initially set gradient ⁇ is successively changed to a next evacuation control property in which the same gradient ⁇ as the initially set gradient ⁇ of the evacuation control property is detected (see Executed Examples 1 through 5)
  • each evacuation control property #1 through #4 are illustratively selected.
  • the frequency of the pump driving system is controlled so as to be gradually increased so that the frequency is increased from 20 Hz to 60 Hz through 30 Hz and 40 Hz, thereby changing the evacuation control properties in order from #4 to #1 to perform pump output control.
  • the pump 23 is driven following the evacuation control property #4 with the gradient ⁇ 4 at the same time as the control starts.
  • the control portion 61 sets the pointer shown in FIG. 6 at the same time as the evacuation starts to scroll the cursor n-m.
  • the gradient ⁇ 4 of the graph in the next evacuation control property #3 is detected.
  • the pump 23 is driven following the evacuation control property #3 (30 Hz) at the same time of the first control change.
  • the control portion 61 continue to scroll the cursor n-m shown in FIG. 6 after the first control change, thereby detecting the gradient ⁇ 4 of the graph in the evacuation control property #2.
  • the pump 23 is driven following the evacuation control property #2 (40 Hz) at the same time of the second control change.
  • the control portion 61 continue to scroll the cursor n-m shown in FIG. 6 after the second control change, thereby detecting the gradient ⁇ 4 of the graph in the evacuation control property #1.
  • P3 27000 [Pa]
  • the control is changed from the evacuation control property #2 to the evacuation control property #1 (Third Control Change).
  • the initially setting gradient ⁇ 4 is kept even in the evacuation control property #1.
  • the initially setting gradient ⁇ 4 is kept, namely, the evacuation control properties are successively changed in order from #4 to #1 through #2 and #3 while the decreased amount of degree of vacuum per unit time is kept constant, thereby enabling the chamber 40 to be evacuated to the specified set target pressure Pf in brief time. In this example, it takes about 9 [seconds] to start the evacuation of the chamber 40 and reach the set target pressure Pf.
  • successive changes of the control properties are referred to as, for example, at detection time of the gradient ⁇ 4, "changes in which a graph of the evacuation control property #4 shown in FIG.
  • three evacuation control properties #1 through #3 are illustratively selected.
  • the frequency of the pump driving system is controlled so as to be gradually increased so that the frequency is increased from 30 Hz to 60 Hz through 40 Hz, thereby changing the evacuation control properties in order from #3 to #1 to perform pump output control.
  • the pump 23 is driven following the evacuation control property #3 (30 Hz) with the gradient ⁇ 3 at the same time as the control starts.
  • the control portion 61 scrolls the cursor n-m, which is similar to the executed example 1, and detects the gradient ⁇ 3 of the graph in the next evacuation control property #2.
  • the pump 23 is driven following the evacuation control property #2 (40 Hz) at the same time of the first control change.
  • the control portion 61 continue to scroll the cursor n-m similarly after the first control change, thereby detecting the gradient ⁇ 3 of the graph in the evacuation control property #1.
  • P2 27000 [Pa]
  • the control is changed from the evacuation control property #2 to the evacuation control property #1 (Second Control Change).
  • the initially setting gradient ⁇ 3 is kept even in the evacuation control property #1.
  • the evacuation control properties are successively changed in order from #3 to #1 through #2, thereby enabling the chamber 40 to be evacuated to the specified set target pressure Pf in brief time.
  • it takes about 8 [seconds] to start the evacuation of the chamber 40 and reach the set target pressure Pf.
  • two evacuation control properties #2 and #3 are illustratively selected.
  • the frequency of the pump driving system is controlled by two stages from 30 Hz to 40 Hz so that the evacuation control properties are changed from #3 to #2 to perform pump output control.
  • the pump 23 is driven following the evacuation control property #3 (30 Hz) with the gradient ⁇ 3 at the same time as the control starts, which is similar to the executed example 2.
  • the control portion 61 scrolls the cursor n-m, which is similar to the executed example 2, and detects the gradient ⁇ 3 of the graph in the next evacuation control property #2.
  • the pump 23 is driven following the evacuation control property #2 (40 Hz) at the same time of this control change.
  • two evacuation control properties #1 and #3 are illustratively selected.
  • the frequency of the pump driving system is controlled by two stages from 30 Hz to 60 Hz so that the evacuation control properties are changed from #3 to #1 to perform pump output control.
  • the pump 23 is driven following the evacuation control property #3 (30 Hz) with the gradient ⁇ 3 at the same time as the control starts, which is similar to the executed example 2, 3.
  • the control portion 61 scrolls the cursor n-m, which is similar to the executed example 2, 3, and detects the gradient ⁇ 3 of the graph in the next evacuation control property #1.
  • the pump 23 is driven following the evacuation control property #1 (60 Hz) at the same time of this control change.
  • two evacuation control properties #1 and #2 are illustratively selected.
  • the frequency of the pump driving system is controlled by two stages from 40 Hz to 60 Hz so that the evacuation control properties are changed from #2 to #1 to perform pump output control.
  • the pump 23 is driven following the evacuation control property #2 (40 Hz) with the gradient ⁇ 2 at the same time as the control starts.
  • the control portion 61 scrolls the cursor n-m, which is similar to the executed example 2, 3, 4, and detects the gradient ⁇ 2 of the graph in the next evacuation control property #1.
  • the pump 23 is driven following the evacuation control property #1 (60 Hz) at the same time of this control change.
  • the evacuation control properties are successively changed from #2 to #1, thereby enabling the chamber 40 to be evacuated to the specified set target pressure Pf in brief time. In this example, it takes about 6.5 [seconds] to start the evacuation of the chamber 40 and reach the set target pressure Pf.
  • FIG. 12 shows a temperature profile of the vacuum reflow furnace 100.
  • a vertical axis indicates work temperature T [degrees C] in each of the preliminary heating zones I through IV, the main heating zone V, the vacuum defoaming and/or deaerating zone VI, and the cooling zone VII and a horizontal axis indicates the elapsed time t1 through t7 [seconds].
  • a solid curve in the drawing indicates temperature characteristics of work in the vacuum reflow furnace 100.
  • FIGS. 13 through 17 relate to control examples on the basis of the work 1. Although other works 1 are processed at the import side of the chamber 40 and the export side thereof at the same time, the description will be performed by paying attention to movement of one work 1 before and after the chamber 40 in order to simplify the description thereof.
  • the work 1 is soldered under vacuum environment wherein the four evacuation control properties (#1 through #4) shown in FIG. 6 are previously prepared in the preliminary evacuation process and the control data D62 is tabled and stored in the storage portion 62.
  • the following evacuation conditions are set by the control portion 61.
  • the control portion 61 receives the initial setting.
  • this initial setting using the operation part 21, any of the four evacuation control properties (#1 through #4) with a desired gradient ⁇ is selected for the control portion 61 among the four evacuation control properties (#1 through #4) with the gradient ⁇ 1 through ⁇ 4.
  • the user selects the evacuation control property having the desired gradient ⁇ among the evacuation control properties (#1 through #4 and the like) in the order of descending numbers (in the order of smaller frequency of pump output) to initially set the evacuation control property with the gradient ⁇ .
  • the setting information obtained thereby is output to the control portion 61 as the operation data D21.
  • the control portion 61 imports the work 1.
  • the control portion 61 carries out the deriving control on the conveyance mechanism 70.
  • the conveyance mechanism 70 receives the conveyance control signal S13 from the control unit 60 and moves the moving beams 18, 28 based on the conveyance control signal S13 to intermittently feed the work 1.
  • the description of the intermittently feeding will be omitted because it is not nature of the invention.
  • the arrival detection signal S26 is output to the control unit 60 to start the timer. Based on this timer, it is possible to calculate a position of the work 1 by intermittently feeding time.
  • the control portion 61 performs the preliminary heating process on the work 1.
  • the preliminary heating portion 20 receives the preliminary heating control signal S20 from the control unit 60 and drives the four preliminary heating zones I through IV based on the preliminary heating portion 20 to gradually heating the work 1 (around 1350 degrees C to around 180 degrees C through 160 and 170 degrees C) for attaining the work 1 at a predetermined temperature (for example, 180 degrees C).
  • the furnace is heated from ordinary temperature to around 130 degrees C at points of time t0 to t1 based on the temperature profile shown in FIG. 12 .
  • the furnace is heated from around 130 degrees C to around 160 degrees C for points of time t1 to t2.
  • the furnace is heated from around 160 degrees C to around 170 degrees C for points of time t2 to t3.
  • the furnace is heated from around 170 degrees C to around 180 degrees C for points of time t3 to t4.
  • the control portion 61 performs the main heating process on the work 1.
  • the main heating portion 30 receives the main heating control signal S30 from the control unit 60 and drives the heaters, the fans and the like in the main heating portion 30 based on the main heating control signal S30 to heat the work 1 to 250 degrees C.
  • the furnace is heated from around 230 degrees C to around 260 degrees C for points of time t4 to t5 in the main heating zone IV.
  • control portion 61 performs the vacuum deaerating process on the work 1.
  • the control portion 61 goes to a subroutine shown in FIG. 14 .
  • the control portion 61 When going to a step ST61, the control portion 61 performs descent control of the container 41 (chamber descent).
  • the elevating mechanism 43 receives the elevating control signal S43 from the control unit 60 and drives a cylinder, not shown, to make the container 41 tightly enclosed.
  • the panel heater receives the heater control signal S44 from the control unit 60 and is configured to maintain temperature of the work 1 at 240 degrees C based on the heater control signal S44.
  • the temperature is maintained of around 230 degrees C to around 250 degrees C for points of time t5 to t6 in the container 41.
  • the control portion 61 then branches the control according to whether or not the evacuation control with the gradient ⁇ 4 is initially set or whether or not the other evacuation control with the gradient ⁇ 3 or ⁇ 2 is initially set. For example, in a case where the four evacuation control properties (#1 through #4) are selected and the evacuation control with the gradient ⁇ 4 is initially set, the control portion 61 goes to a step ST63 where it performs the evacuation control with the gradient ⁇ 4.
  • control portion 61 goes to a subroutine shown in FIG. 15 where at a step ST401, it controls the pump output according to the evacuation control property #4 with the gradient ⁇ 4 shown in FIG. 7 .
  • the pump 23 is driven according to the evacuation control property #4 (20 Hz) with the gradient ⁇ 4 at the same time of the control to evacuate the chamber 40.
  • the release valves receive the release valves control signal S25 from the control unit 60 to make an initial release valves and a main release valves "fully opened”.
  • the electromagnetic valve 22 receives the electromagnetic valve control signal S22 from the control unit 60 to drive the valve based on the electromagnetic valve control signal S22 so that valve opening position is "full opening position”.
  • the control portion 61 then controls the electromagnetic valve 22 and the pump 23 to evacuate the chamber 40.
  • the pump 23 receives the pump driving voltage V23 from the control unit 60 before and after the time when the valve opening position is a "full opening position" and evacuates to the chamber 40 based on the pump driving voltage V23.
  • the pump 23 operates to pull the air within the container 41 by an evacuation amount according to the evacuation control property #4 (20 Hz) with the gradient ⁇ 4.
  • the control portion 61 detects the gradient ⁇ 4 in a graph of the next evacuation control property #3.
  • this pressure P1 goes back to a step ST403 where the evacuation is kept according to the evacuation control property #4.
  • the control portion 61 detects the gradient ⁇ 4 in a graph of the evacuation control property #3 at the step ST402, it goes to a step ST404 where the control portion 61 changes the control so that the evacuation control property #4 is succeeded to the evacuation control property #3 at a point of the pressure P1 when detecting the gradient ⁇ 4 (first time). Even in the evacuation control property #3, the gradient ⁇ 4 of the initially setting time is kept and the pump 23 is driven following the evacuation control property #3 (30 Hz).
  • the control portion 61 then detects the gradient ⁇ 4 in a graph of the next evacuation control property #2.
  • the control portion 61 continues to scroll the cursor n-m shown in FIG. 6 after the first control change and detects the gradient ⁇ 4 in a graph of the evacuation control property #2.
  • this pressure P2 is not detected, it goes back to a step ST406 where the evacuation is kept according to the evacuation control property #3.
  • the control portion 61 detects the gradient ⁇ 4 in a graph of the evacuation control property #2 at the step 405, it goes to a step ST407 where the control portion 61 changes the control so that the evacuation control property #3 is succeeded to the evacuation control property #2 at a point of the pressure P2 when detecting the gradient ⁇ 4 (second time). Even in the evacuation control property #2, the gradient ⁇ 4 of the initially setting time is kept and the pump 23 is driven following the evacuation control property #2 (40 Hz).
  • the control portion 61 then detects the gradient ⁇ 4 in a graph of the next evacuation control property #1.
  • the control portion 61 continues to scroll the cursor n-m shown in FIG. 6 after the second control change and detects the gradient ⁇ 4 in a graph of the evacuation control property #1.
  • this pressure P3 goes back to a step ST409 where the evacuation is kept according to the evacuation control property #2.
  • the control portion 61 detects the gradient ⁇ 4 in a graph of the evacuation control property #1 at the step 408, it goes to a step ST410 where the control portion 61 changes the control so that the evacuation control property #2 is succeeded to the evacuation control property #1 at a point of the pressure P3 when detecting the gradient ⁇ 4 (third time). Even in the evacuation control property #1, the gradient ⁇ 4 of the initially setting time is kept and the pump 23 is driven following the evacuation control property #1 (60 Hz).
  • Pf set target pressure
  • the control portion 61 goes to a step ST64 where it branches the control according to whether or not the evacuation control with the gradient ⁇ 3 is initially set or whether or not the other evacuation control with the gradient ⁇ 2 is initially set. For example, in a case where the three evacuation control properties (#1 through #3) are selected and the evacuation control with the gradient ⁇ 3 is initially set, the control portion 61 goes to a step ST65 where it performs the evacuation control with the gradient ⁇ 3.
  • control portion 61 goes to a subroutine shown in FIG. 16 where at a step ST601, it controls the pump output according to the evacuation control property #3 with the gradient ⁇ 3 shown in FIG. 8 .
  • the pump 23 is driven according to the evacuation control property #3 (30 Hz) with the gradient ⁇ 3 at the same time of the control start.
  • the control portion 61 detects the gradient ⁇ 3 in a graph of the next evacuation control property #2.
  • this pressure P1 goes back to a step ST603 where the evacuation is kept according to the evacuation control property #3.
  • the control portion 61 detects the gradient ⁇ 3 in a graph of the evacuation control property #2 at the step 602, it goes to a step ST604 where the control portion 61 changes the control so that the evacuation control property #3 is succeeded to the evacuation control property #2 at a point of the pressure P1 when detecting the gradient ⁇ 3 (first time). Even in the evacuation control property #2, the gradient ⁇ 3 of the initially setting time is kept and the pump 23 is driven following the evacuation control property #2 (40 Hz).
  • the control portion 61 then detects the gradient ⁇ 3 in a graph of the next evacuation control property #1.
  • the control portion 61 continues to scroll the cursor n-m shown in FIG. 6 after the first control change and detects the gradient ⁇ 3 in a graph of the evacuation control property #1.
  • this pressure P2 goes back to a step ST606 where the evacuation is kept according to the evacuation control property #2.
  • the control portion 61 detects the gradient ⁇ 3 in a graph of the evacuation control property #1 at the step 605, it goes to a step ST607 where the control portion 61 changes the control so that the evacuation control property #2 is succeeded to the evacuation control property #1 at a point of the pressure P2 when detecting the gradient ⁇ 3 (second time). Even in the evacuation control property #1, the gradient ⁇ 3 of the initially setting time is kept and the pump 23 is driven following the evacuation control property #1 (60 Hz).
  • the control portion 61 branches the control according to whether or not the chamber 40 reaches the set target pressure Pf. If the chamber 40 does not reach the set target pressure Pf, it goes back to a step ST609 where the evacuation according to the evacuation control property #1 is continued. If the set target pressure Pf is reached at the step ST608, it goes back to the step ST65 of the subroutine. Under the evacuation control with the gradient ⁇ 3, the evacuation control properties #3 to #1 through #2 are succeeded so that it is possible to evacuate the chamber 40 to the specified set target pressure Pf in brief time.
  • the control portion 61 goes to a step ST66 where it performs the evacuation control with the gradient ⁇ 2. For example, in a case where the two evacuation control properties (#1 and #2) are selected and the evacuation control with the gradient ⁇ 2 is initially set, the control portion 61 goes to the step ST66.
  • the control portion 61 goes to a subroutine shown in FIG. 17 where at a step ST701, it controls the pump output according to the evacuation control property #2 with the gradient ⁇ 2 shown in FIG. 11 .
  • the pump 23 is driven according to the evacuation control property #2 (40 Hz) with the gradient ⁇ 2 at the same time of the control start.
  • the control portion 61 then detects the gradient ⁇ 2 in a graph of the next evacuation control property #1.
  • this pressure P1 goes back to a step ST703 where the evacuation is kept according to the evacuation control property #2. If the control portion 61 detects the gradient ⁇ 2 in a graph of the evacuation control property #1 at the step 702, it goes to a step ST704 where the control portion 61 changes the control so that the evacuation control property #2 is succeeded to the evacuation control property #1 at a point of the pressure P1 when detecting the gradient ⁇ 2. Even in the evacuation control property #1, the gradient ⁇ 2 of the initially setting time is kept and the pump 23 is driven following the evacuation control property #1 (60 Hz).
  • the control portion 61 branches the control according to whether or not the chamber 40 reaches the set target pressure Pf. If the chamber 40 does not reach the set target pressure Pf, it goes back to a step ST706 where the evacuation according to the evacuation control property #1 is continued. If the set target pressure Pf is reached at the step ST705, it goes back to the step ST66 of the subroutine. Under the evacuation control with the gradient ⁇ 2, the evacuation control properties #2 to #1 are succeeded so that it is possible to evacuate the chamber 40 to the specified set target pressure Pf in brief time.
  • the control portion 61 maintains the set target pressure Pf for a predetermined time.
  • the control portion 61 adjusts the electromagnetic valve 22 and the release valves 25 to maintain the vacuum in the chamber 40 at the set target pressure Pf for vacuum maintaining time.
  • the vacuum maintaining time is maximum settable time when the set target pressure Pf can be maintained within vacuum processing time without hindrance of intermittent feeding in setting of the vacuum processing time calculated as work multiplied by intermittent waiting unit time. If the time calculated as work multiplied by intermittent waiting unit time is short, throughput of the vacuum reflow furnace is improved.
  • the control portion 61 determines whether or not the vacuum deaerating process is completed. In this moment, for example, in a case of this embodiment, since the work 1 is intermittently fed, it is determined on the basis of the set intermittent feeding time. Accordingly, it is possible to solder (remove voids) while the vacuum in the chamber 40 is maintained at fixed atmospheric pressure for specified time (vacuum deaerating process).
  • the control portion 61 stops the observation and starts vacuum break in the chamber 40 at a step ST69.
  • the pump 23 stops, the release valves 25 operate and N 2 gas is supplied to the chamber 40 so that the vacuum pressure in the container 41 raises on with a fixed ratio (like a linear function) (see a linear characteristic shown in FIG. 7 ).
  • the control portion 61 goes to a step ST70 where it controls the elevating mechanism 43 to raise the container 41.
  • the elevating mechanism 43 receives the elevating control signal S43 from the control unit 60 and operates a cylinder, not shown, or the like based on the elevating control signal S43 to make the container 41 opened.
  • the control portion 61 then performs the export process on the work.
  • the conveyance mechanism 70 receives the conveyance control signal S70 from the control unit 60 and moves the moving beam 28 based on the conveyance control signal S70 to intermittently feed the work 1 (see FIG. 5 ).
  • the conveyance mechanism 70 is configured to carry a next work 1 onto the base 42.
  • the control portion 61 performs cooling process on the work 1.
  • the cooling portion 50 receives the cooling control signal S50 from the control unit 60 and operates the heat exchangers, the fans and the like based on the cooling control signal S50 to cool the work 1. Accordingly, it is possible to cool the work 1 at desired temperature, 60 degrees C.
  • the control portion 61 controls the conveyance mechanism 70 so as to export the work 1 from the cooling portion 50 to outside.
  • the control portion 61 determines whether or not the vacuum soldering process of all the works 1 are completed. If the vacuum soldering process of all the works 1 is not completed, it returned to the step ST2 where the carry-in process of the work 1, the heating process thereof, the vacuum deaerating process thereof and the cooling process thereof are continued. If the vacuum soldering process of all the works 1 is completed, it finishes the control.
  • the four vacuum control properties #1 through #4 are previously prepared and the control portion 61 is provided to perform the evacuation control on the pump 23.
  • the control portion 61 is configured to perform the pump output control by the vacuum control property with the gradient ⁇ , to observe the gradient ⁇ in real time with the evacuation control property with the gradient ⁇ to be changed, and to change from the evacuation control property of small pump output to the evacuation control property of large pump output based on the initially set gradient ⁇ of the evacuation control property.
  • the control portion 61 may refer to the evacuation control property based on the vacuum pressure detection signal S24 and change the pump output from the evacuation control property having large gradient ⁇ to the evacuation control property having small gradient ⁇ when the vacuum pressure in the chamber reaches the change point of the degree of vacuum of the evacuation control property.
  • control portion 61 obtains the above-mentioned four evacuation control properties #1 through #4 at the preliminary evacuation time and produces the table shown in FIG 6 . From the table, the pointer for change the evacuation control properties with the initially set gradient ⁇ is previously found out (calculated).
  • the storage portion 62 stores the control data D62 of the change points, which have been obtained by this calculation.
  • FIG. 18 shows this storage example.
  • the evacuation control properties are not limited to four properties #4, #3, #2 and #1.
  • the control portion 61 performs a step of detecting the vacuum pressure in the chamber 40 and referring to the tabled evacuation control properties #1 through #4 based on pressure detection information (vacuum pressure detection signal S24) and a step of changing the pump output from the evacuation control property having large gradient ⁇ to the evacuation control property having small gradient ⁇ when the vacuum pressure (degree of the vacuum) in the chamber 40 reaches the change point for changing the evacuation control properties.
  • P43 in the parenthesis indicates vacuum pressure of the change point from the evacuation control property #4 to the evacuation control property #3 when performing the evacuation control property #4.
  • the control portion 61 is configured to change the evacuation control property #4 to the evacuation control property #3 so as to take over the control at the time when the vacuum pressure detection signal S24 indicating the vacuum pressure P43 is detected.
  • the control portion 61 is configured to change the control from the evacuation control property #3 to the evacuation control property #2 at the time when the vacuum pressure detection signal S24 indicating the vacuum pressure P32 is detected.
  • the control portion 61 is configured to change the control from the evacuation control property #2 to the evacuation control property #1 at the time when the vacuum pressure detection signal S24 indicating the vacuum pressure P21 is detected. All of the vacuum pressures P43, P32 and P21 are previously obtained from the tabled evacuation control properties #1 through #4 before the main evacuation.
  • the storage portion 62 stores these programs and the control data D62. By the control, it is also possible to evacuate the chamber 40 to the specified set target pressure Pf in brief time. It is further possible to reduce load of the control portion 61 from the control to observe the gradient ⁇ in real time to the control to detect the vacuum pressure detection signal S24.
  • a plurality of the evacuation control properties with the gradients ⁇ plotting the degree of vacuum in relation to the evacuation time when evacuating the chamber 40 by a predetermined pump output is previously prepared, and the control portion 61 which performs evacuation control of the pump so that the evacuation control property of small pump output is changed to the evacuation control property of large pump output based on the initially set gradient ⁇ of the evacuation control property is provided. Accordingly, even if the evacuation control property having the initially set gradient ⁇ becomes a gradient more than the gradient ⁇ by a predetermined gradient (for example, +around 20 % through around 50%: hereinafter, referred to as "threshold gradient 8th"), it can be also applied to a case of change to other evacuation control property.
  • a predetermined gradient for example, +around 20 % through around 50%: hereinafter, referred to as "threshold gradient 8th
  • the threshold gradient ⁇ th is a change evaluation criterion which differs on the basis of setting number of the evacuation control properties or the property selected from the plurality of the set control properties.
  • the threshold gradient ⁇ th can be preferably set so as to be within a range of 20 % through 50 %, preferably 30 % through 50 %.
  • the threshold gradient ⁇ th can be preferably set so as to be within a range of 30 % through 40 %, on the basis of the balance between a rate of incidence of the voids, evacuation time and the like.
  • the control portion 61 is configured to always compare the initially set gradient ⁇ in the evacuation control properties with the above-mentioned threshold gradient ⁇ th during the evacuation and to change the control from the evacuation control property of small pump output to the evacuation control property of large pump output when the initially set gradient ⁇ of the evacuation control properties exceeds the threshold gradient ⁇ th.
  • This invention is very preferably applicable to a vacuum reflow furnace which has a function to defoam and/or deaerate vacuum molten solder when soldering surface mounting components or the like on a substrate while mounting the components on predetermined positions of the substrate.

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EP13900455.0A 2013-12-25 2013-12-25 Vacuum soldering apparatus and control method therefor Active EP3088116B1 (en)

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JP6778880B1 (ja) * 2020-06-29 2020-11-04 千住金属工業株式会社 はんだ付け装置及びパッキンの異常の検知方法
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WO2015097796A1 (ja) 2015-07-02
KR101839717B1 (ko) 2018-03-16
EP3088116A1 (en) 2016-11-02
CN105848814B (zh) 2018-01-19
KR20160102031A (ko) 2016-08-26
TWI617387B (zh) 2018-03-11
US20160339531A1 (en) 2016-11-24
JP5601436B1 (ja) 2014-10-08
EP3088116A4 (en) 2016-11-30
TW201529218A (zh) 2015-08-01
US9676048B2 (en) 2017-06-13
JPWO2015097796A1 (ja) 2017-03-23
CN105848814A (zh) 2016-08-10

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